During the Assault on the castle in the game's Prologue, a dead body can be found near the large iron gates to the castle. The body is wearing a white, hooded cloak tied with red and brown garments and it appears that the cause of death was falling from a great height into a cart of hay. Geralt comments upon finding the corpse: "Hmm... Guess they'll never learn.", and then receives one point in the Assassination Attribute. This is a reference to the first Assassin's Creed game and its protagonist, Altaïr.
Contributed by MehDeletingLater
Attachment
Attachment
 
Video